Abstract
With the new American Chemical Society approved option in environmental chemistry at the undergraduate level, there is a need for laboratory experiments illustrating fundamental concepts within a framework of environmental applications. We describe here a UV-visible spectroscopy experiment on gaseous NO2, which is appropriate for a junior-senior level instrumental analysis course. This experiment illustrates (1) the effects of spectral resolution as well as shifts in the 2 NO2 N2O4 equilibrium on the Beer-Lambert law; and (2) the use of differential optical absorption spectrometry to measure NO2 and other trace gases and pollutants in the troposphere.
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